void WritePhyRegister(ENC28J60PhyRegister registerAddress, UInt16 value)
{
lock (_spiLock)
{
// write the PHY register address to MIREGADR
WriteControlRegister(ENC28J60Register.MIREGADR, (byte)registerAddress);
// write the value to our MIWRL and MIWRH registers, in that order.
WriteControlRegister(ENC28J60Register.MIWRL, ENC28J60Register.MIWRH, value);
// wait for the PHY register value to be written successfully
Int64 startTicks = Microsoft.SPOT.Hardware.Utility.GetMachineTime().Ticks;
bool miiOperationSuccess = false;
byte mistat;
do
{
mistat = ReadControlRegister(ENC28J60Register.MISTAT, true);
if ((mistat & (byte)ENC28J60RegisterBits.MISTAT_BUSY) == 0x00)
{
miiOperationSuccess = true;
break;
}
} while ((Utility.GetMachineTime().Ticks - startTicks) / System.TimeSpan.TicksPerMillisecond < 20); // wait up to 20ms
if (!miiOperationSuccess)
throw new Exception(); /* TODO: this should be a "could not configure network interface" exception */
}
}
UInt16 ReadPhyRegister(ENC28J60PhyRegister registerAddress)
{
lock (_spiLock)
{
// write the PHY register address to MIREGADR
WriteControlRegister(ENC28J60Register.MIREGADR, (byte)registerAddress);
// set the MICMD.MIIRD bit to retrieve the register value
byte micmd = ReadControlRegister(ENC28J60Register.MICMD, true);
micmd |= (byte)ENC28J60RegisterBits.MICMD_MIIRD;
WriteControlRegister(ENC28J60Register.MICMD, micmd);
// wait for the PHY register value to be read successfully
Int64 startTicks = Microsoft.SPOT.Hardware.Utility.GetMachineTime().Ticks;
bool miiOperationSuccess = false;
byte mistat;
do
{
mistat = ReadControlRegister(ENC28J60Register.MISTAT, true);
if ((mistat & (byte)ENC28J60RegisterBits.MISTAT_BUSY) == 0x00)
{
miiOperationSuccess = true;
break;
}
} while ((Utility.GetMachineTime().Ticks - startTicks) / System.TimeSpan.TicksPerMillisecond < 20); // wait up to 20ms
if (!miiOperationSuccess)
throw new Exception(); /* TODO: this should be a "could not configure network interface" exception */
// retrieve our register value
UInt16 returnValue = ReadControlRegister(ENC28J60Register.MIRDL, ENC28J60Register.MIRDH, true);
// clear the MICMD.MIIRD bit
micmd &= (byte)~ENC28J60RegisterBits.MICMD_MIIRD;
WriteControlRegister(ENC28J60Register.MICMD, micmd);
// return our register value
return returnValue;
}
}
